Blizzard made protoss health not heal/repair-able out of both balance and race diversity reasons - but i never found a lore/story explanation as to why protoss can't or won't fix their damaged units.
Since Terran medics and scvs are able to either heal or repair all protoss units, i imagine that protoss do have the technology to fix themselves - but that they refuse to do so out of some spiritual reason... however i could be completely wrong.
Does anyone know the true lore/story reason (either from games or from books) as to why protoss can't/won't heal and repair their own units?